Patellar motion analyzed by magnetic resonance imaging

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Abstract
We have analyzed the normal patellar motion during the first 30.degree. of knee flexion by magnetic resonance imaging (MRI). Ten males and 10 females without knee symptoms were examined. The patellar articulation was imaged both sagitally and axially with the knee symptoms were examined. The patellar articulation was imaged both sagitally and axially produced through the middle of the patellar articular cartilage. When the knee was in extension compared to 30.degree. flexion, the sulcus angle was greater, the lateral patellofemoral angle was smaller, there was more lateral patellar displacement, the patella tilted more laterally, and the congruence angle was directed more laterally. Differences between males and females were found.

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